HYDRAPAC ITALIA S.r.l. s.u.- HYDRAULIC COMPONENTS Vicolo Del Lavoro, 9 40069 Zola Predosa (Bologna) Italy tel. +39 051 755082 / fax +39 051 6185568/ mob.+39 340 5929116
E-mail: italia@hydrapac.it
Internet site: http://www.hydrapac.it/
SPOOL VALVE HYDRAULIC MOTORS The operating principle of the motors is based on an internal gear design, consisting of a stator and rotor through which the output torque and speed are transmitted. The distributor valve is driven synchronously by the rotor through a cardan shaft ensuring that each one of the chambers of the motor are filled and emptied precisely. EPMM, EPM, EPML, EPRM, EPRML and EPMH motors have a Spool Valve.
SPOOL VALVE - The distributor valve has been integrated with the output shaft. The valve has hydrodynamic bearings, and has infinite life when load ratings are not exceeded. GEAR SET - There are two forms of stator, hence and of gear set: EPMM, EPM and EPML have plain teeth. These types motors are suitable for long operating periods at moderate pressures- or short operating periods at high pressures. EPRM, EPRML and EPMH have teeth fitted with rollers. The rollers reduce local stress and the tangential reaction forces on the rotor reducing friction to a minimum. This gives long operating life and better efficiency even at continuous high pressures. Roller Gear Sets are recommended for operation with thin oil and for applications having continually reversing loads.
Standard Motor The standard motor mounting flange is located as close to the output shaft as possible. This type of
mounting supports the motor close to the shaft load. This mounting flange is also compatible with many standard gear boxes.
Wheel Motor
This type mounting flange makes the motor possible to fit a wheel hub or a winch drum so that the radial load acts midway between the two motor bearings. This gives the best utilization of the bearing capacity and is a very compact solution.
Needle Bearing EPM and EPRM have an output shaft supported in needle bearing. These types motors are suitable for absorbing static and dynamic radial loads.
Low Leakage
LL Series hydraulic motors have been designed to operate at the whole standard range of working conditions (pressure drop and frequency of rotation ) , but with considerable decreased volumetric losses in the drainage ports. Their main purpose is to operate as series-connected motors in hydraulic systems. For this version is permissible decreasing of the maximal torque with up to 5% (at middle speed) and up to 10 % (at high speed) in comparison to the standard versions of motors.
Low Speed Valve
LSV Series hydraulic motors have been designed to operate with normal pressure drop and to ensure -1 smooth run at low speed (up to 200 min ), as the best security for operation is guaranteed at frequency -1 of rotation 20 ÷ 50 min . They have an increased starting pressure drop and are not recommended for using at pressure less than 40 bar.
Free Running
FR Series hydraulic motors have been designed to operate with high frequencies of rotation /over than -1 300 min / and low pressure drop. These motors are produced with increased clearance at all friction parts. Additional advantages of “FR” version are prolonging of the life of the hydraulic motors at high frequencies of rotation, as well as the possibility to use them in systems with big variation of the loading. Volumetric efficiency can be affected. 3